The venture will conduct an environmental impact assessment after earlier tests confirmed an area in Hachimantai City has 15 MW of geothermal capacity, the companies said in a statement Thursday.
The partners are aiming for the plant to start running in 2022, Hiroshi Shimizu, a spokesman for Mitsubishi Materials, said by phone.
Mitsubishi Materials has a 60 percent stake in the venture, while Mitsubishi Gas Chemical holds the remainder.
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